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2( 5a + 4a ) = 80
2 ( 9a ) = 80
28a = 80
a = 80/28
a = 2,85
pajang
5a = 5 x 2,85
= 14,25
2( 5a + 4a) = 80
2(9a) = 80
28a = 80
a = 80/28
a= 2,85
sehingga panjangnya 5a = 5 x 2,85 = 14,25